Bursitis Around the Knee

Evidence: Limited / Insufficient Evidence — ASPN 2024: Not an ASPN-graded indication

CAUSES

• Repetitive kneeling (“housemaid’s knee/prepatellar bursitis,” common in flooring work or gardening)
• Direct trauma or a fall onto the knee
• Overuse from running or cycling (pes anserine bursitis)
• Friction from tight hamstrings or excess body weight
• Less commonly, infection or gout

SYMPTOMS

• A soft, localized swelling over the front or inner side of the knee
• Tenderness directly over the bursa
• Pain with kneeling or direct pressure, more than with movement itself
• Occasional warmth or redness

IMAGING

Ultrasound is the best first test — it quickly distinguishes bursitis from other causes of swelling and can guide a needle aspiration for sample testing.

CAN PRP HELP?

Most knee bursitis resolves with activity changes, ice, and sometimes a corticosteroid injection or aspiration. Unfortunately, research on PRP for this specific problem is still limited. We don’t consider PRP a first-line treatment here, but it can be a reasonable option for bursitis that keeps recurring despite standard care.

Leukocyte Preparation: Leukocyte-Poor

Dosing: Single Injection

ASPN 2024 CONSENSUS GUIDELINE

ASPN grades gluteal (trochanteric) tendon/bursa pathology and the subacromial bursa in the shoulder, but prepatellar and pes anserine bursitis specifically aren’t a named indication in either the core guideline or our supplemental update — using PRP here means extrapolating from the broader tendon/bursa literature rather than following a graded recommendation.

Sources: D’Souza et al. (ASPN Consensus), Journal of Pain Research, 2024 · Katz et al., Current Reviews in Musculoskeletal Medicine, 2024

FREQUENTLY ASKED QUESTIONS

How is bursitis around the knee different from arthritis or a meniscus tear?

Bursitis is inflammation of one of the small cushioning sacs around the knee, usually from repetitive kneeling, friction, or a fall. This trauma causes soft, localized swelling and tenderness right over the bursa, worse with kneeling or direct pressure. Joint-line or activity-related pain typical of arthritis or a meniscus tear is typically worse with movement.

Is PRP the first thing to try for knee bursitis?

Most cases resolve with activity changes, ice, and sometimes a corticosteroid injection or aspiration. PRP can be considered as a reasonable alternative option for bursitis that keeps recurring despite standard care.

How do you confirm it’s bursitis and not something else causing knee swelling?

Ultrasound is the best first test that tells bursitis apart from other causes of swelling and can guide a needle if fluid needs to taken. MRI is reserved for difficult to diagnose cases.

Why isn’t knee bursitis part of the ASPN 2024 guideline?

ASPN grades trochanteric tendon/bursa pathology and the subacromial bursa in the shoulder, but prepatellar and pes anserine bursitis around the knee aren’t named indications in the core guidelines or its supplements. Using PRP here means extrapolating from the broader tendon/bursa literature rather than following a formally graded recommendation.